One of the earliest observations about capital is that it creates it's own grave diggers. Marx was very clear that the crisis of capitalism is of over production followed by collapse.

Capital brings people into cities, towns, etc so that they can work for a wage. It then organizes them on the shop floor, in kitchens, in sweatshops, and in office buildings, and then skims off the surplus they produce. It's at this point that the workers can realize "Hey wait a minute, we already do everything. Why should we allow the "owner" to take our surplus when can decide what to do with it ourselves.